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2. Model Name: Solar Still for Desalination
Working Principle: The model uses solar energy to desalinate seawater,
separating salt and impurities to obtain freshwater.
Materials Required: Plastic container, glass jar, plastic wrap, stones,
seawater, and sunlight.
DIY Making Procedure:
a. Fill the plastic container with seawater.
b. Place the glass jar in the center of the container.
c. Cover the container with plastic wrap, ensuring it's tightly sealed.
d. Place a small stone on top of the plastic wrap, just above the glass jar.
e. Position the model in direct sunlight and wait for freshwater to
condense and collect in the glass jar.
Why Is the Model Useful: This model demonstrates a sustainable and
eco-friendly approach to obtain freshwater from seawater, which is
essential in regions facing water scarcity.
Tips for Presentation: Discuss the global issue of water scarcity and how
solar stills can offer a viable solution in such areas.